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大气科学  2014 

中国夏季和冬季极端干旱年代际变化及成因分析

DOI: 10.3878/j.issn.1006-9895.2013.12219

Keywords: PDSI干旱指数,极端干旱,年代际变化

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Abstract:

依据1961~2009年中国区域540个气象站的夏、冬季气温和降水数据,首先采用气候变化趋势转折判别模型(简称PLFIM)分析了中国区域8个分区夏、冬季气温和降水的年代际变化,而后利用PDSI干旱指数研究了夏、冬季极端干旱在年代际尺度上的时空变化特征及其成因。结果表明:1961~2009年中国夏季极端干旱发生率北方大于南方,冬季则为在东部多而在西部少。夏季和冬季极端干旱发生概率在最后一次年代际转折后都呈增加趋势。在区域尺度上,夏季东北、华北和西北地区增加明显,冬季东北、华北、华南、西南地区增加显著。其中,降水在20世纪90年代以前的极端干旱变化中起主导作用,而后由于气候变暖所引起的极端干旱增加趋势逐渐增大,与降水变化的作用相互叠加。

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